Pinpoint Test I : The BCM (Body Control Module) Does Not Respond To The Diagnostic Scan Tool

WARNING: This page is about a different car, the 2020 Lincoln Corsair. However, it is still accessible from the selected car via links, so may be relevant.

Refer to POWER DISTRIBUTION/BCM for schematic and connector information. Refer to MODULE COMMUNICATIONS NETWORK for schematic and connector information.
Normal Operation and Fault Conditions

The BCM communicates on the HS-CAN1.

Possible Sources
- Fuse
- Wiring, terminals and connector
- BCM
Visual Inspection and Pre-checks
- Verify High Current BJB MEGA fuse 3 (125A) and BJB fuse 1 (40A) are OK.

I1 CHECK THE BCM (BODY CONTROL MODULE) VOLTAGE SUPPLY CIRCUITS FOR AN OPEN

Ignition OFF.

Disconnect: BCM C2280A and C2280B.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2280A-1	Courtesy of FORD MOTOR COMPANY	Ground

Positive Lead	Measurement / Action	Negative Lead
C2280B-1	Courtesy of FORD MOTOR COMPANY	Ground

Are the voltages greater than 11 volts?

Yes	Connect BCM C2280A and C2280B. GO to I2

No	VERIFY High Current BJB MEGA fuse 3 (125A) or BJB fuse 1 (40A) is OK. If OK, repair the circuit. If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible causes of the circuit short.

I2 CHECK THE BCM (BODY CONTROL MODULE) GROUND CIRCUITS FOR AN OPEN

Ignition OFF.

Disconnect: BCM C2280F.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2280F-8	Courtesy of FORD MOTOR COMPANY	Ground
C2280F-9	Courtesy of FORD MOTOR COMPANY	Ground
C2280F-24	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances less than 3 ohms?

Yes

GO to I3

No	REPAIR the circuit in question.

I3 CHECK THE HS-CAN1 (HIGH-SPEED CONTROLLER AREA NETWORK 1) CIRCUITS BETWEEN THE BCM (BODY CONTROL MODULE) AND THE GWM (GATEWAY MODULE A) FOR AN OPEN

Disconnect: BCM C2280E.

Disconnect GWM C2431.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2280E-4	Courtesy of FORD MOTOR COMPANY	C2431-20
C2280E-5	Courtesy of FORD MOTOR COMPANY	C2431-19

Are the resistances less than 3 ohms?

Yes

GO to I4

No	REPAIR the circuit in question.

I4 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION

Disconnect and inspect all the BCM connectors.

Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

Reconnect the BCM connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable service articles: TSB, General Service Bulletin (GSB), SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BCM. REFER to: Body Control Module (BCM) .

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.